shell.c

   1 #include "cache.h"
   2 #include "quote.h"
   3 #include "exec_cmd.h"
   4 #include "strbuf.h"
   5
   6 /* Stubs for functions that make no sense for git-shell. These stubs
   7  * are provided here to avoid linking in external redundant modules.
   8  */
   9 void release_pack_memory(size_t need, int fd){}
  10 void trace_argv_printf(const char **argv, const char *fmt, ...){}
  11 void trace_printf(const char *fmt, ...){}
  12
  13
  14 static int do_generic_cmd(const char *me, char *arg)
  15 {
  16         const char *my_argv[4];
  17
  18         setup_path(NULL);
  19         if (!arg || !(arg = sq_dequote(arg)))
  20                 die("bad argument");
  21         if (prefixcmp(me, "git-"))
  22                 die("bad command");
  23
  24         my_argv[0] = me + 4;
  25         my_argv[1] = arg;
  26         my_argv[2] = NULL;
  27
  28         return execv_git_cmd(my_argv);
  29 }
  30
  31 static int do_cvs_cmd(const char *me, char *arg)
  32 {
  33         const char *cvsserver_argv[3] = {
  34                 "cvsserver", "server", NULL
  35         };
  36
  37         if (!arg || strcmp(arg, "server"))
  38                 die("git-cvsserver only handles server: %s", arg);
  39
  40         setup_path(NULL);
  41         return execv_git_cmd(cvsserver_argv);
  42 }
  43
  44
  45 static struct commands {
  46         const char *name;
  47         int (*exec)(const char *me, char *arg);
  48 } cmd_list[] = {
  49         { "git-receive-pack", do_generic_cmd },
  50         { "git-upload-pack", do_generic_cmd },
  51         { "cvs", do_cvs_cmd },
  52         { NULL },
  53 };
  54
  55 int main(int argc, char **argv)
  56 {
  57         char *prog;
  58         struct commands *cmd;
  59
  60         /*
  61          * Special hack to pretend to be a CVS server
  62          */
  63         if (argc == 2 && !strcmp(argv[1], "cvs server"))
  64                 argv--;
  65
  66         /*
  67          * We do not accept anything but "-c" followed by "cmd arg",
  68          * where "cmd" is a very limited subset of git commands.
  69          */
  70         else if (argc != 3 || strcmp(argv[1], "-c"))
  71                 die("What do you think I am? A shell?");
  72
  73         prog = argv[2];
  74         if (!strncmp(prog, "git", 3) && isspace(prog[3]))
  75                 /* Accept "git foo" as if the caller said "git-foo". */
  76                 prog[3] = '-';
  77
  78         for (cmd = cmd_list ; cmd->name ; cmd++) {
  79                 int len = strlen(cmd->name);
  80                 char *arg;
  81                 if (strncmp(cmd->name, prog, len))
  82                         continue;
  83                 arg = NULL;
  84                 switch (prog[len]) {
  85                 case '\0':
  86                         arg = NULL;
  87                         break;
  88                 case ' ':
  89                         arg = prog + len + 1;
  90                         break;
  91                 default:
  92                         continue;
  93                 }
  94                 exit(cmd->exec(cmd->name, arg));
  95         }
  96         die("unrecognized command '%s'", prog);
  97 }